花生壳苯酚液化产物制备高耐水性木材胶黏剂的研究

Preparation of high water-resistant wood adhesive with peanut shell phenol-liquefied products

以花生壳苯酚液化产物(PL)为主要原料,采用正交试验研究了加成反应的低温反应时间、缩聚反应的高温反应时间以及反应结束时的温度对花生壳苯酚液化产物-甲醛(PLPF)树脂胶合性能的影响,优化了树脂合成工艺,研究了三聚氰胺改性树脂及其PLPF的共混改性工艺,制备出了高耐水性生物质基木材胶黏剂。研究结果表明:当高温反应时间为40 min,最终反应温度为70℃时,可以获得性能优良的PLPF树脂。通过与三聚氰胺改性树脂共混改性PLPF胶黏剂所制试件的胶合强度可知:将PLPF树脂与三聚氰胺以7∶3的质量比共混,可以将共混改性PLPF树脂所制试件的平均胶合强度提高到1.1 MPa;而将改性树脂单独用于胶合板制备时,胶合性能较差。全反射红外光谱图显示,三聚氰胺与PLPF树脂会发生交联反应,改性PLPF树脂的图谱中存在明显的三聚氰胺特征结构,同时,也保留了部分PLPF树脂的特征结构。DSC分析显示,改性PLPF树脂与PLPF树脂相比,固化温度范围变小,反应热降低,热固化反应程度降低。

Peanut shell phenol liquefaction product(PL)was used as the main raw material to prepare peanut shell phenolliquefied product formaldehyde(PLPF)resin.By using the orthogonal experiment method,the low temperature reaction time of the addition reaction,the high temperature reaction time of the polycondensation reaction and the temperature at the end of the reaction were investigated to improve the bonding performance of the PLPF resin and optimize the resin synthesis process.The blending process of the melaminemodified resin and the PLPF resin was modified to develop a biomassbased wood adhesive with high water resistance.The results showed that the high performance PLPF resin can be obtained when the hightemperature reaction time of the polycondensation reaction was 40 min and the temperature at the end of the reaction was 70℃.Afterwards,by blending with melamine modifier,the bonding strength of the PLPF resin can be improved,which is one of the most efficient modification methods for optimizing its structural performance.The results proved that the bonding strength can be improved by blending PLPF resin with melamine in mass ratio of 7〖DK〗∶3,the average bonding strength was up to 1.1 MPa.However,the enhancement of melamine modifier was limited.When the melamine modifier was used alone for plywood pressing,the bonding properties were poor.The results of the ATRFTIR spectra showed that there was a crosslinking reaction between melamine and PLPF resins,and the characteristic structure of the melamine resin was obvious and the characteristic structure of partial PLPF resin remained.Compared with the PLPF resin,the results of differential scanning calorimetry(DSC)profile showed that the modified PLPF resin had a narrower curing temperature range and a lower reaction heat,leading to a reduction in degree of heat curing reaction.